[sprio]

I concur with futuresoptions on this one - I'm in Tennessee, as well, with a vented crawl space, and a 30 year old house. I'm in the process of slowly sealing all of the seams with tape and mastic, and wrapping the ducts with insulation. Not the most fun job in the world, but, like adding extra insulation to the attic floors, will pay off in a more comfortable home, with the satisfaction of having done the job myself (so I know it's right), for less money.